public class Example4_9 {
  public static void main (String args[]) {
    SIM simOne=new SIM(18810300560L);
    MobileTelephone mobile = new MobileTelephone();
    mobile.setSIM(simOne);
    System.out.println("手机号码："+mobile.lookNumber());
    SIM simTwo = new SIM(18690795231L);
    mobile.setSIM(simTwo);
    System.out.println("手机号码："+mobile.lookNumber());
  }
}
